BOX TWO FIXED SEAT CLAMP|Black (25.4mm) Fits: 22.2mm Post|Black (31.8mm) Fits: 27.2mm Post|Black (34.9mm) Fits: 30.4mm Post (Depending on Frame)

The Box Two Fixed Seat Clamp is made from 6061-T6 aluminum and is cold forged for maximum strength. Box makes them in a handful of sizes to fit many bike frames.